Piezoelectric energy trapping and detecting method based on external forced vibration

Abstract

The invention discloses a piezoelectric energy trapping and detecting method based on external forced vibration. According to the method, by means of adoption of a beam and slab structure and a simple support supporting mode, energy trapping for piezoelectrics is achieved by forced vibration. The method includes: firstly, converting forced vibration mechanical energy into alternating-current signals according to a piezoelectric effect; then, utilizing a full-bridge rectification circuit for rectifying the alternating-current signals; finally, utilizing a capacitance filtering circuit for achieving stable direct current output. According to design, a switching circuit with a light-emitting diode and an oscilloscope is provided for achieving qualitative and quantitative detection of an energy trapping process. The piezoelectric energy trapping and detecting method based on external forced vibration has the advantages that detection is simple, convenient and accurate, energy trapping is simple and stable in supporting, dependency on vibration frequencies of external vibration sources is weak, and the method is promising in application prospect on the aspect of self-energy-supply of low-energy-consumption electronic devices.

Description

technical field [0001] The invention belongs to the field of piezoelectric energy harvesting methods, in particular to a piezoelectric energy harvesting and detection method based on external forced vibration. Background technique [0002] The mechanical energy of environmental vibration exists in a wide range and has a high energy density. It is of great significance to collect, store and utilize external vibration energy. Under the existing technical conditions, the methods of converting common vibrational mechanical energy into usable electrical energy (energy capture) are mainly divided into three types: electromagnetic conversion, electrostatic conversion and piezoelectric conversion. Electromagnetic conversion is based on the phenomenon of electromagnetic induction, which converts mechanical energy into electrical energy. The main disadvantage of its method is that the coil it uses is bulky, and the output voltage is small, so the effect is poor. Electrostatic conver...

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Problems solved by technology

The disadvantages of these methods are that the structure is complicated, the manufacturing cost is high, and the stability of the cantilever structure is poor.

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